Don't assert when we do a rule tree GC and the root nodes still has strong references.
Don't assert when we do a rule tree GC and the root nodes still has strong references.

It could still have children.

CJ8664/servo,KiChjang/servo,eddyb/servo,saneyuki/servo,ConnorGBrewster/servo,eddyb/servo,emilio/servo,anthgur/servo,szeged/servo,peterjoel/servo,peterjoel/servo,larsbergstrom/servo,KiChjang/servo,saneyuki/servo,DominoTree/servo,emilio/servo,peterjoel/servo,upsuper/servo,notriddle/servo,dsandeephegde/servo,szeged/servo,mattnenterprise/servo,DominoTree/servo,dati91/servo,paulrouget/servo,pyfisch/servo,fiji-flo/servo,anthgur/servo,paulrouget/servo,emilio/servo,larsbergstrom/servo,canaltinova/servo,notriddle/servo,rnestler/servo,saneyuki/servo,nnethercote/servo,sadmansk/servo,szeged/servo,sadmansk/servo,paulrouget/servo,pyfisch/servo,larsbergstrom/servo,pyfisch/servo,szeged/servo,avadacatavra/servo,dati91/servo,sadmansk/servo,eddyb/servo,fiji-flo/servo,dati91/servo,dati91/servo,fiji-flo/servo,pyfisch/servo,jimberlage/servo,SimonSapin/servo,thiagopnts/servo,avadacatavra/servo,mbrubeck/servo,saneyuki/servo,DominoTree/servo,DominoTree/servo,paulrouget/servo,fiji-flo/servo,pyfisch/servo,cbrewster/servo,notriddle/servo,mbrubeck/servo,avadacatavra/servo,dsandeephegde/servo,larsbergstrom/servo,notriddle/servo,fiji-flo/servo,sadmansk/servo,splav/servo,upsuper/servo,CJ8664/servo,sadmansk/servo,jimberlage/servo,SimonSapin/servo,splav/servo,larsbergstrom/servo,dati91/servo,szeged/servo,dati91/servo,mattnenterprise/servo,emilio/servo,notriddle/servo,dati91/servo,canaltinova/servo,splav/servo,larsbergstrom/servo,peterjoel/servo,saneyuki/servo,fiji-flo/servo,emilio/servo,jimberlage/servo,splav/servo,splav/servo,szeged/servo,ConnorGBrewster/servo,nnethercote/servo,mattnenterprise/servo,splav/servo,nnethercote/servo,mbrubeck/servo,dati91/servo,saneyuki/servo,KiChjang/servo,peterjoel/servo,peterjoel/servo,larsbergstrom/servo,notriddle/servo,rnestler/servo,larsbergstrom/servo,anthgur/servo,DominoTree/servo,cbrewster/servo,dsandeephegde/servo,saneyuki/servo,ConnorGBrewster/servo,nnethercote/servo,mattnenterprise/servo,cbrewster/servo,canaltinova/servo,szeged/servo,upsuper/servo,dsandeephegde/servo,pyfisch/servo,thiagopnts/servo,thiagopnts/servo,splav/servo,avadacatavra/servo,mattnenterprise/servo,ConnorGBrewster/servo,sadmansk/servo,cbrewster/servo,peterjoel/servo,larsbergstrom/servo,thiagopnts/servo,anthgur/servo,KiChjang/servo,paulrouget/servo,fiji-flo/servo,mbrubeck/servo,dsandeephegde/servo,splav/servo,eddyb/servo,jimberlage/servo,rnestler/servo,splav/servo,cbrewster/servo,nnethercote/servo,DominoTree/servo,ConnorGBrewster/servo,CJ8664/servo,saneyuki/servo,emilio/servo,SimonSapin/servo,thiagopnts/servo,sadmansk/servo,notriddle/servo,canaltinova/servo,avadacatavra/servo,mattnenterprise/servo,eddyb/servo,mbrubeck/servo,dsandeephegde/servo,jimberlage/servo,pyfisch/servo,saneyuki/servo,peterjoel/servo,notriddle/servo,pyfisch/servo,splav/servo,SimonSapin/servo,pyfisch/servo,sadmansk/servo,jimberlage/servo,CJ8664/servo,KiChjang/servo,mbrubeck/servo,mattnenterprise/servo,rnestler/servo,notriddle/servo,nnethercote/servo,SimonSapin/servo,canaltinova/servo,upsuper/servo,nnethercote/servo,thiagopnts/servo,CJ8664/servo,saneyuki/servo,jimberlage/servo,KiChjang/servo,DominoTree/servo,ConnorGBrewster/servo,cbrewster/servo,DominoTree/servo,upsuper/servo,mattnenterprise/servo,rnestler/servo,anthgur/servo,canaltinova/servo,paulrouget/servo,CJ8664/servo,rnestler/servo,mbrubeck/servo,KiChjang/servo,SimonSapin/servo,emilio/servo,jimberlage/servo,dsandeephegde/servo,KiChjang/servo,upsuper/servo,cbrewster/servo,nnethercote/servo,anthgur/servo,nnethercote/servo,paulrouget/servo,peterjoel/servo,upsuper/servo,DominoTree/servo,avadacatavra/servo,rnestler/servo,paulrouget/servo,CJ8664/servo,anthgur/servo,cbrewster/servo,paulrouget/servo,peterjoel/servo,DominoTree/servo,ConnorGBrewster/servo,avadacatavra/servo,szeged/servo,emilio/servo,paulrouget/servo,rnestler/servo,SimonSapin/servo,CJ8664/servo,anthgur/servo,KiChjang/servo,thiagopnts/servo,eddyb/servo,mbrubeck/servo,emilio/servo,dsandeephegde/servo,nnethercote/servo,larsbergstrom/servo,thiagopnts/servo,szeged/servo,canaltinova/servo,eddyb/servo,notriddle/servo,emilio/servo,fiji-flo/servo,pyfisch/servo,jimberlage/servo,canaltinova/servo,KiChjang/servo,ConnorGBrewster/servo,eddyb/servo,SimonSapin/servo,avadacatavra/servo,szeged/servo,upsuper/servo